SOMLIT pH data overview
15 September 2026
1 Location of SOMLIT stations
The monitoring sites are grouped into their parent SOMLIT stations and ordered from north to south throughout this document.
| SOMLIT station | Monitoring site(s) |
|---|---|
| Wimereux | Point L, Point C |
| Luc-sur-Mer | Smile, Luc-sur-Mer |
| Dinard | Le Buron, Cézembre |
| Roscoff | Estacade, Astan |
| Brest | Portzic, Lanvéoc |
| La Rochelle | Antioche |
| Gironde | pk86, pk52, pk30 |
| Arcachon | Comprian, Eyrac, Bouée 13 |
| Banyuls | Sola |
| Sète | Sète |
| Marseille | Frioul |
| Villefranche-sur-Mer | Point B |
2 All pH data
2.1 Data availability
Availability is assessed before any filter related to changes in pH measurement method. Only the following filters are applied:
- pH must be between 6 and 10;
- the sampling level must be
S(surface) orF(bottom).
All observations assigned to S are pooled irrespective
of numerical depth; the same rule is applied to observations assigned to
F.
| Site | Station | Depth | Start date | End date | Time span (years) | Number of observations | Minimum depth (m) | Maximum depth (m) |
|---|---|---|---|---|---|---|---|---|
| Wimereux | Point C | Surface | 1997-12-03 | 2026-06-15 | 28.5 | 402 | 1.0 | 2.0 |
| Bottom | 1997-12-03 | 2026-06-15 | 28.5 | 398 | 25.0 | 25.0 | ||
| Point L | Surface | 1997-12-03 | 2026-06-15 | 28.5 | 322 | 1.0 | 1.0 | |
| Bottom | 1997-12-03 | 2026-06-15 | 28.5 | 318 | 50.0 | 50.0 | ||
| Luc-sur-Mer | Luc-sur-Mer | Surface | 2007-01-04 | 2026-02-02 | 19.1 | 410 | 2.0 | 2.0 |
| Bottom | ||||||||
| Smile | Surface | 2013-04-09 | 2026-02-02 | 12.8 | 255 | 2.0 | 2.0 | |
| Bottom | ||||||||
| Dinard | Cézembre | Surface | 2014-03-07 | 2023-08-21 | 9.5 | 195 | 1.0 | 1.0 |
| Bottom | ||||||||
| Le Buron | Surface | 2012-03-27 | 2023-08-21 | 11.4 | 269 | 1.0 | 1.0 | |
| Bottom | 2012-03-27 | 2013-11-21 | 1.7 | 49 | 22.0 | 22.0 | ||
| Roscoff | Astan | Surface | 2001-01-08 | 2026-06-23 | 25.5 | 605 | 1.0 | 1.0 |
| Bottom | 2001-01-04 | 2026-06-23 | 25.5 | 601 | 60.0 | 60.0 | ||
| Estacade | Surface | 2001-01-08 | 2026-06-23 | 25.5 | 607 | 1.0 | 1.0 | |
| Bottom | ||||||||
| Brest | Lanvéoc | Surface | 2019-01-28 | 2026-04-23 | 7.2 | 158 | 2.0 | 2.0 |
| Bottom | ||||||||
| Portzic | Surface | 2002-03-19 | 2026-04-27 | 24.1 | 1169 | 2.0 | 2.0 | |
| Bottom | ||||||||
| La Rochelle | Antioche | Surface | 2011-06-22 | 2026-07-03 | 15.0 | 325 | 1.0 | 1.0 |
| Bottom | ||||||||
| Gironde | pk30 | Surface | 1997-09-08 | 2026-03-27 | 28.5 | 513 | 1.0 | 1.0 |
| Bottom | 1997-09-08 | 2026-03-27 | 28.5 | 512 | 4.0 | 10.0 | ||
| pk52 | Surface | 1997-09-11 | 2026-03-25 | 28.5 | 518 | 1.0 | 1.0 | |
| Bottom | 1997-10-07 | 2026-03-25 | 28.5 | 517 | 2.0 | 9.0 | ||
| pk86 | Surface | 1997-09-09 | 2026-03-26 | 28.5 | 484 | 1.0 | 1.0 | |
| Bottom | 1997-10-08 | 2026-03-26 | 28.5 | 480 | 7.0 | 13.0 | ||
| Arcachon | Bouée 13 | Surface | 2005-02-03 | 2026-04-23 | 21.2 | 447 | 1.0 | 22.0 |
| Bottom | ||||||||
| Comprian | Surface | 2005-02-03 | 2026-04-23 | 21.2 | 447 | 1.0 | 8.0 | |
| Bottom | ||||||||
| Eyrac | Surface | 1997-09-24 | 2026-04-23 | 28.6 | 720 | 1.0 | 7.3 | |
| Bottom | 1997-09-24 | 2004-09-17 | 7.0 | 270 | 6.0 | 6.0 | ||
| Banyuls | Sola | Surface | 2002-04-02 | 2026-04-30 | 24.1 | 1067 | 3.0 | 3.0 |
| Bottom | 2002-04-02 | 2026-04-30 | 24.1 | 1070 | 24.0 | 24.0 | ||
| Sète | Sète | Surface | 2017-10-24 | 2025-12-17 | 8.1 | 177 | 1.0 | 2.0 |
| Bottom | ||||||||
| Marseille | Frioul | Surface | 2011-01-11 | 2026-05-26 | 15.4 | 355 | 1.0 | 1.0 |
| Bottom | 2011-01-11 | 2026-05-26 | 15.4 | 328 | 1.0 | 55.0 | ||
| Villefranche-sur-Mer | Point B | Surface | 2007-01-09 | 2024-03-25 | 17.2 | 793 | 1.0 | 2.0 |
| Bottom | 2007-01-09 | 2024-03-25 | 17.2 | 780 | 50.0 | 50.0 |
The figure below shows the dates on which pH observations are available at each monitoring site, before applying any method-date filter.
2.2 Method changes
| SOMLIT site | Monitoring station | Method history |
|---|---|---|
| Wimereux | Point C | pHNBS → pHT on 2021-09-07 |
| Wimereux | Point L | pHNBS → pHT on 2021-09-07 |
| Luc-sur-Mer | Luc-sur-Mer | pHNBS → pHT on 2020-01-21 |
| Luc-sur-Mer | Smile | pHNBS → pHT on 2020-01-21 |
| Dinard | Cézembre | pHNBS only |
| Dinard | Le Buron | pHNBS only |
| Roscoff | Astan | pHNBS → pHT on 2018-01-11 |
| Roscoff | Estacade | pHNBS → pHT on 2018-01-11 |
| Brest | Lanvéoc | pHNBS only |
| Brest | Portzic | pHNBS → pHT on 2019-07-01 |
| La Rochelle | Antioche | pHNBS → pHT on 2021-01-05 |
| Gironde | pk30 | pHNBS only |
| Gironde | pk52 | pHNBS only |
| Gironde | pk86 | pHNBS only |
| Arcachon | Bouée 13 | pHNBS → pHT on 2020-10-08 |
| Arcachon | Comprian | pHNBS → pHT on 2020-10-08 |
| Arcachon | Eyrac | pHNBS → pHT on 2020-10-08 |
| Banyuls | Sola | pHNBS → pHT on 2019-01-01 |
| Sète | Sète | pHNBS → pHT on 2020-10-09 |
| Marseille | Frioul | pHNBS → pHT on 2018-02-07 |
| Villefranche-sur-Mer | Point B | pHT only |
2.3 Data visualisation
The SOMLIT stations are presented from north to south. The change from the potentiometric method on the NBS scale (pHNBS) to the spectrophotometric method on the total scale (pHT) is indicated by a vertical line.
2.3.1 Wimereux
2.3.2 Luc-sur-Mer
2.3.3 Dinard
2.3.4 Roscoff
2.3.5 Brest
2.3.6 La Rochelle
2.3.7 Gironde
2.3.8 Arcachon
2.3.9 Banyuls
2.3.10 Sète
2.3.11 Marseille
2.3.12 Villefranche-sur-Mer
The figures above are descriptive. The method dates are used only to distinguish pHNBS from pHT; no observation has been removed.
3 Potentiometric data (pHNBS)
3.1 Data availability
| Site | Station | Depth | Start date | End date | Time span (years) | Number of observations | Minimum depth (m) | Maximum depth (m) |
|---|---|---|---|---|---|---|---|---|
| Wimereux | Point C | Surface | 1997-12-03 | 2021-07-26 | 23.6 | 347 | 1.0 | 2.0 |
| Bottom | 1997-12-03 | 2021-07-26 | 23.6 | 343 | 25.0 | 25.0 | ||
| Point L | Surface | 1997-12-03 | 2021-07-26 | 23.6 | 281 | 1.0 | 1.0 | |
| Bottom | 1997-12-03 | 2021-07-26 | 23.6 | 277 | 50.0 | 50.0 | ||
| Luc-sur-Mer | Luc-sur-Mer | Surface | 2007-01-04 | 2019-12-13 | 12.9 | 284 | 2.0 | 2.0 |
| Bottom | ||||||||
| Smile | Surface | 2013-04-09 | 2019-12-11 | 6.7 | 129 | 2.0 | 2.0 | |
| Bottom | ||||||||
| Dinard | Cézembre | Surface | 2014-03-07 | 2023-08-21 | 9.5 | 195 | 1.0 | 1.0 |
| Bottom | ||||||||
| Le Buron | Surface | 2012-03-27 | 2023-08-21 | 11.4 | 269 | 1.0 | 1.0 | |
| Bottom | 2012-03-27 | 2013-11-21 | 1.7 | 49 | 22.0 | 22.0 | ||
| Roscoff | Astan | Surface | 2001-01-08 | 2017-12-12 | 16.9 | 405 | 1.0 | 1.0 |
| Bottom | 2001-01-04 | 2017-12-12 | 16.9 | 402 | 60.0 | 60.0 | ||
| Estacade | Surface | 2001-01-08 | 2017-12-12 | 16.9 | 406 | 1.0 | 1.0 | |
| Bottom | ||||||||
| Brest | Lanvéoc | Surface | 2019-01-28 | 2026-04-23 | 7.2 | 158 | 2.0 | 2.0 |
| Bottom | ||||||||
| Portzic | Surface | 2002-03-19 | 2019-06-21 | 17.3 | 837 | 2.0 | 2.0 | |
| Bottom | ||||||||
| La Rochelle | Antioche | Surface | 2011-06-22 | 2020-12-07 | 9.5 | 210 | 1.0 | 1.0 |
| Bottom | ||||||||
| Gironde | pk30 | Surface | 1997-09-08 | 2026-03-27 | 28.5 | 513 | 1.0 | 1.0 |
| Bottom | 1997-09-08 | 2026-03-27 | 28.5 | 512 | 4.0 | 10.0 | ||
| pk52 | Surface | 1997-09-11 | 2026-03-25 | 28.5 | 518 | 1.0 | 1.0 | |
| Bottom | 1997-10-07 | 2026-03-25 | 28.5 | 517 | 2.0 | 9.0 | ||
| pk86 | Surface | 1997-09-09 | 2026-03-26 | 28.5 | 484 | 1.0 | 1.0 | |
| Bottom | 1997-10-08 | 2026-03-26 | 28.5 | 480 | 7.0 | 13.0 | ||
| Arcachon | Bouée 13 | Surface | 2005-02-03 | 2020-09-24 | 15.6 | 334 | 1.0 | 1.0 |
| Bottom | ||||||||
| Comprian | Surface | 2005-02-03 | 2020-09-24 | 15.6 | 334 | 1.0 | 1.0 | |
| Bottom | ||||||||
| Eyrac | Surface | 1997-09-24 | 2020-09-24 | 23.0 | 607 | 1.0 | 1.0 | |
| Bottom | 1997-09-24 | 2004-09-17 | 7.0 | 270 | 6.0 | 6.0 | ||
| Banyuls | Sola | Surface | 2002-04-02 | 2018-12-18 | 16.7 | 760 | 3.0 | 3.0 |
| Bottom | 2002-04-02 | 2018-12-18 | 16.7 | 763 | 24.0 | 24.0 | ||
| Sète | Sète | Surface | 2017-10-24 | 2020-09-16 | 2.9 | 50 | 1.0 | 2.0 |
| Bottom | ||||||||
| Marseille | Frioul | Surface | 2011-01-11 | 2017-12-13 | 6.9 | 167 | 1.0 | 1.0 |
| Bottom | 2011-01-11 | 2018-01-24 | 7.0 | 152 | 55.0 | 55.0 | ||
| Villefranche-sur-Mer | Point B | Surface | ||||||
| Bottom |
3.2 Data visualisation
3.2.1 Wimereux
3.2.2 Luc-sur-Mer
3.2.3 Dinard
3.2.4 Roscoff
3.2.5 Brest
3.2.6 La Rochelle
3.2.7 Gironde
3.2.8 Arcachon
3.2.9 Banyuls
3.2.10 Sète
3.2.11 Marseille
3.3 Descriptive statistics
| Site | Station | Depth | Start date | End date | Time span (years) | N | Mean pHNBS | Median pHNBS | Minimum pHNBS | Maximum pHNBS |
|---|---|---|---|---|---|---|---|---|---|---|
| Wimereux | Point L | Surface | 1997-12-03 | 2021-07-26 | 23.6 | 281 | 8.171 | 8.150 | 7.910 | 8.630 |
| Bottom | 1997-12-03 | 2021-07-26 | 23.6 | 277 | 8.168 | 8.160 | 7.880 | 8.490 | ||
| Point C | Surface | 1997-12-03 | 2021-07-26 | 23.6 | 347 | 8.192 | 8.170 | 7.870 | 8.580 | |
| Bottom | 1997-12-03 | 2021-07-26 | 23.6 | 343 | 8.186 | 8.160 | 7.850 | 8.580 | ||
| Luc-sur-Mer | Smile | Surface | 2013-04-09 | 2019-12-11 | 6.7 | 129 | 8.085 | 8.070 | 7.900 | 9.090 |
| Bottom | ||||||||||
| Luc-sur-Mer | Surface | 2007-01-04 | 2019-12-13 | 12.9 | 284 | 8.112 | 8.100 | 7.420 | 9.000 | |
| Bottom | ||||||||||
| Dinard | Le Buron | Surface | 2012-03-27 | 2023-08-21 | 11.4 | 269 | 8.018 | 8.020 | 7.570 | 8.680 |
| Bottom | 2012-03-27 | 2013-11-21 | 1.7 | 49 | 8.037 | 8.040 | 7.930 | 8.190 | ||
| Cézembre | Surface | 2014-03-07 | 2023-08-21 | 9.5 | 195 | 8.002 | 8.020 | 7.470 | 8.260 | |
| Bottom | ||||||||||
| Roscoff | Estacade | Surface | 2001-01-08 | 2017-12-12 | 16.9 | 406 | 8.070 | 8.060 | 7.880 | 8.420 |
| Bottom | ||||||||||
| Astan | Surface | 2001-01-08 | 2017-12-12 | 16.9 | 405 | 8.031 | 8.030 | 7.820 | 8.270 | |
| Bottom | 2001-01-04 | 2017-12-12 | 16.9 | 402 | 8.034 | 8.030 | 7.850 | 8.280 | ||
| Brest | Portzic | Surface | 2002-03-19 | 2019-06-21 | 17.3 | 837 | 8.080 | 8.070 | 7.750 | 8.470 |
| Bottom | ||||||||||
| Lanvéoc | Surface | 2019-01-28 | 2026-04-23 | 7.2 | 158 | 7.863 | 7.860 | 7.730 | 8.140 | |
| Bottom | ||||||||||
| La Rochelle | Antioche | Surface | 2011-06-22 | 2020-12-07 | 9.5 | 210 | 8.027 | 8.030 | 7.770 | 8.210 |
| Bottom | ||||||||||
| Gironde | pk86 | Surface | 1997-09-09 | 2026-03-26 | 28.5 | 484 | 8.083 | 8.070 | 6.980 | 8.900 |
| Bottom | 1997-10-08 | 2026-03-26 | 28.5 | 480 | 8.080 | 8.060 | 6.980 | 10.000 | ||
| pk52 | Surface | 1997-09-11 | 2026-03-25 | 28.5 | 518 | 7.956 | 7.960 | 7.080 | 8.660 | |
| Bottom | 1997-10-07 | 2026-03-25 | 28.5 | 517 | 7.945 | 7.950 | 7.040 | 8.600 | ||
| pk30 | Surface | 1997-09-08 | 2026-03-27 | 28.5 | 513 | 7.858 | 7.880 | 6.920 | 8.540 | |
| Bottom | 1997-09-08 | 2026-03-27 | 28.5 | 512 | 7.856 | 7.880 | 6.990 | 8.540 | ||
| Arcachon | Comprian | Surface | 2005-02-03 | 2020-09-24 | 15.6 | 334 | 8.027 | 8.020 | 7.720 | 8.430 |
| Bottom | ||||||||||
| Eyrac | Surface | 1997-09-24 | 2020-09-24 | 23.0 | 607 | 8.093 | 8.100 | 7.710 | 8.510 | |
| Bottom | 1997-09-24 | 2004-09-17 | 7.0 | 270 | 8.099 | 8.120 | 7.530 | 8.350 | ||
| Bouée 13 | Surface | 2005-02-03 | 2020-09-24 | 15.6 | 334 | 8.113 | 8.110 | 7.490 | 9.950 | |
| Bottom | ||||||||||
| Banyuls | Sola | Surface | 2002-04-02 | 2018-12-18 | 16.7 | 760 | 8.149 | 8.140 | 7.760 | 8.550 |
| Bottom | 2002-04-02 | 2018-12-18 | 16.7 | 763 | 8.156 | 8.141 | 7.730 | 8.590 | ||
| Sète | Sète | Surface | 2017-10-24 | 2020-09-16 | 2.9 | 50 | 8.188 | 8.147 | 7.813 | 8.753 |
| Bottom | ||||||||||
| Marseille | Frioul | Surface | 2011-01-11 | 2017-12-13 | 6.9 | 167 | 8.186 | 8.180 | 8.040 | 8.310 |
| Bottom | 2011-01-11 | 2018-01-24 | 7.0 | 152 | 8.163 | 8.160 | 7.910 | 8.310 | ||
| Villefranche-sur-Mer | Point B | Surface | ||||||||
| Bottom |
3.4 Monthly climatologies
The climatology uses every individual observation, without prior averaging by year-month.
3.4.1 Wimereux
3.4.2 Luc-sur-Mer
3.4.3 Dinard
3.4.4 Roscoff
3.4.5 Brest
3.4.6 La Rochelle
3.4.7 Gironde
3.4.8 Arcachon
3.4.9 Banyuls
3.4.10 Sète
3.4.11 Marseille
3.5 Monthly anomalies
Each anomaly is calculated for an individual observation; no monthly averaging is performed.
3.5.1 Wimereux
3.5.2 Luc-sur-Mer
3.5.3 Dinard
3.5.4 Roscoff
3.5.5 Brest
3.5.6 La Rochelle
3.5.7 Gironde
3.5.8 Arcachon
3.5.9 Banyuls
3.5.10 Sète
3.5.11 Marseille
3.6 Temporal trends
Trends are estimated from individual anomalies using GLS models with an AR(1) correlation structure applied to observations in chronological order. This retains all observations, including measurements sharing the same date.
| Site | Station | Depth | N | Start date | End date | Time span (years) | Slope per decade | SE per decade | Lower 95% CI per decade | Upper 95% CI per decade | p-value | AR(1) rho | Model |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wimereux | Point C | Bottom | 343 | 1997-12-03 | 2021-07-26 | 23.6 | -0.0104 | 0.0131 | -0.0361 | 0.0153 | 0.4266 | 0.4786 | GLS AR(1) |
| Surface | 347 | 1997-12-03 | 2021-07-26 | 23.6 | 0.0078 | 0.0136 | -0.0189 | 0.0346 | 0.5648 | 0.4817 | GLS AR(1) | ||
| Point L | Bottom | 277 | 1997-12-03 | 2021-07-26 | 23.6 | -0.0101 | 0.0130 | -0.0357 | 0.0154 | 0.4358 | 0.4939 | GLS AR(1) | |
| Surface | 281 | 1997-12-03 | 2021-07-26 | 23.6 | -0.0022 | 0.0143 | -0.0303 | 0.0259 | 0.8780 | 0.5062 | GLS AR(1) | ||
| Luc-sur-Mer | Luc-sur-Mer | Surface | 284 | 2007-01-04 | 2019-12-13 | 12.9 | -0.1460 | 0.0222 | -0.1897 | -0.1022 | <0.0001 | 0.3121 | GLS AR(1) |
| Smile | Surface | 129 | 2013-04-09 | 2019-12-11 | 6.7 | -0.1486 | 0.0525 | -0.2525 | -0.0446 | 0.0054 | 0.1377 | GLS AR(1) | |
| Dinard | Cézembre | Surface | 195 | 2014-03-07 | 2023-08-21 | 9.5 | -0.1713 | 0.0284 | -0.2273 | -0.1153 | <0.0001 | 0.0838 | GLS AR(1) |
| Le Buron | Bottom | 49 | 2012-03-27 | 2013-11-21 | 1.7 | 0.2345 | 0.2078 | -0.1836 | 0.6526 | 0.2649 | 0.5049 | GLS AR(1) | |
| Surface | 269 | 2012-03-27 | 2023-08-21 | 11.4 | -0.0994 | 0.0207 | -0.1401 | -0.0587 | <0.0001 | 0.1657 | GLS AR(1) | ||
| Roscoff | Astan | Bottom | 402 | 2001-01-04 | 2017-12-12 | 16.9 | -0.1256 | 0.0073 | -0.1399 | -0.1113 | <0.0001 | 0.5153 | GLS AR(1) |
| Surface | 405 | 2001-01-08 | 2017-12-12 | 16.9 | -0.1202 | 0.0072 | -0.1344 | -0.1060 | <0.0001 | 0.4552 | GLS AR(1) | ||
| Estacade | Surface | 406 | 2001-01-08 | 2017-12-12 | 16.9 | -0.1305 | 0.0079 | -0.1460 | -0.1150 | <0.0001 | 0.3928 | GLS AR(1) | |
| Brest | Lanvéoc | Surface | 158 | 2019-01-28 | 2026-04-23 | 7.2 | -0.0257 | 0.0148 | -0.0550 | 0.0036 | 0.0847 | 0.0470 | GLS AR(1) |
| Portzic | Surface | 837 | 2002-03-19 | 2019-06-21 | 17.3 | -0.1675 | 0.0079 | -0.1829 | -0.1520 | <0.0001 | 0.6010 | GLS AR(1) | |
| La Rochelle | Antioche | Surface | 210 | 2011-06-22 | 2020-12-07 | 9.5 | -0.0705 | 0.0248 | -0.1193 | -0.0217 | 0.0049 | 0.4643 | GLS AR(1) |
| Gironde | pk30 | Bottom | 512 | 1997-09-08 | 2026-03-27 | 28.5 | -0.0791 | 0.0159 | -0.1104 | -0.0478 | <0.0001 | 0.4514 | GLS AR(1) |
| Surface | 513 | 1997-09-08 | 2026-03-27 | 28.5 | -0.0661 | 0.0157 | -0.0969 | -0.0353 | <0.0001 | 0.4191 | GLS AR(1) | ||
| pk52 | Bottom | 517 | 1997-10-07 | 2026-03-25 | 28.5 | -0.0167 | 0.0155 | -0.0473 | 0.0138 | 0.2815 | 0.4885 | GLS AR(1) | |
| Surface | 518 | 1997-09-11 | 2026-03-25 | 28.5 | -0.0095 | 0.0150 | -0.0389 | 0.0199 | 0.5242 | 0.4982 | GLS AR(1) | ||
| pk86 | Bottom | 480 | 1997-10-08 | 2026-03-26 | 28.5 | 0.0425 | 0.0172 | 0.0087 | 0.0762 | 0.0137 | 0.4408 | GLS AR(1) | |
| Surface | 484 | 1997-09-09 | 2026-03-26 | 28.5 | 0.0430 | 0.0180 | 0.0077 | 0.0783 | 0.0172 | 0.5482 | GLS AR(1) | ||
| Arcachon | Bouée 13 | Surface | 334 | 2005-02-03 | 2020-09-24 | 15.6 | -0.2109 | 0.0213 | -0.2528 | -0.1690 | <0.0001 | 0.2388 | GLS AR(1) |
| Comprian | Surface | 334 | 2005-02-03 | 2020-09-24 | 15.6 | -0.1365 | 0.0161 | -0.1682 | -0.1048 | <0.0001 | 0.4199 | GLS AR(1) | |
| Eyrac | Bottom | 270 | 1997-09-24 | 2004-09-17 | 7.0 | 0.2341 | 0.0363 | 0.1626 | 0.3055 | <0.0001 | 0.1050 | GLS AR(1) | |
| Surface | 607 | 1997-09-24 | 2020-09-24 | 23.0 | -0.0707 | 0.0085 | -0.0874 | -0.0541 | <0.0001 | 0.4111 | GLS AR(1) | ||
| Banyuls | Sola | Bottom | 763 | 2002-04-02 | 2018-12-18 | 16.7 | -0.0136 | 0.0233 | -0.0592 | 0.0321 | 0.5598 | 0.7877 | GLS AR(1) |
| Surface | 760 | 2002-04-02 | 2018-12-18 | 16.7 | -0.0158 | 0.0225 | -0.0599 | 0.0283 | 0.4829 | 0.7448 | GLS AR(1) | ||
| Sète | Sète | Surface | 50 | 2017-10-24 | 2020-09-16 | 2.9 | -1.2244 | 0.5712 | -2.3730 | -0.0759 | 0.0372 | 0.7063 | GLS AR(1) |
| Marseille | Frioul | Bottom | 152 | 2011-01-11 | 2018-01-24 | 7.0 | -0.0873 | 0.0307 | -0.1480 | -0.0265 | 0.0052 | 0.4323 | GLS AR(1) |
| Surface | 167 | 2011-01-11 | 2017-12-13 | 6.9 | -0.0530 | 0.0234 | -0.0992 | -0.0069 | 0.0246 | 0.3830 | GLS AR(1) |
3.6.1 Wimereux
3.6.2 Luc-sur-Mer
3.6.3 Dinard
3.6.4 Roscoff
3.6.5 Brest
3.6.6 La Rochelle
3.6.7 Gironde
3.6.8 Arcachon
3.6.9 Banyuls
3.6.10 Sète
3.6.11 Marseille
4 Spectrophotometric data (pHT)
4.1 Data availability
Only observations collected on or after the method-change date are
retained in this section. Monitoring sites without a valid method-change
date therefore have no retained spectrophotometric data and are shown as
NA.
| Site | Station | Depth | Start date | End date | Time span (years) | Number of observations | Minimum depth (m) | Maximum depth (m) |
|---|---|---|---|---|---|---|---|---|
| Wimereux | Point C | Surface | 2021-09-07 | 2026-06-15 | 4.8 | 55 | 1.0 | 1.0 |
| Bottom | 2021-09-07 | 2026-06-15 | 4.8 | 55 | 25.0 | 25.0 | ||
| Point L | Surface | 2021-09-07 | 2026-06-15 | 4.8 | 41 | 1.0 | 1.0 | |
| Bottom | 2021-09-07 | 2026-06-15 | 4.8 | 41 | 50.0 | 50.0 | ||
| Luc-sur-Mer | Luc-sur-Mer | Surface | 2020-01-21 | 2026-02-02 | 6.0 | 126 | 2.0 | 2.0 |
| Bottom | ||||||||
| Smile | Surface | 2020-01-21 | 2026-02-02 | 6.0 | 126 | 2.0 | 2.0 | |
| Bottom | ||||||||
| Dinard | Cézembre | Surface | ||||||
| Bottom | ||||||||
| Le Buron | Surface | |||||||
| Bottom | ||||||||
| Roscoff | Astan | Surface | 2018-01-11 | 2026-06-23 | 8.4 | 200 | 1.0 | 1.0 |
| Bottom | 2018-01-11 | 2026-06-23 | 8.4 | 199 | 60.0 | 60.0 | ||
| Estacade | Surface | 2018-01-11 | 2026-06-23 | 8.4 | 201 | 1.0 | 1.0 | |
| Bottom | ||||||||
| Brest | Lanvéoc | Surface | ||||||
| Bottom | ||||||||
| Portzic | Surface | 2019-07-01 | 2026-04-27 | 6.8 | 332 | 2.0 | 2.0 | |
| Bottom | ||||||||
| La Rochelle | Antioche | Surface | 2021-01-05 | 2026-07-03 | 5.5 | 115 | 1.0 | 1.0 |
| Bottom | ||||||||
| Gironde | pk30 | Surface | ||||||
| Bottom | ||||||||
| pk52 | Surface | |||||||
| Bottom | ||||||||
| pk86 | Surface | |||||||
| Bottom | ||||||||
| Arcachon | Bouée 13 | Surface | 2020-10-08 | 2026-04-23 | 5.5 | 113 | 1.0 | 22.0 |
| Bottom | ||||||||
| Comprian | Surface | 2020-10-08 | 2026-04-23 | 5.5 | 113 | 1.0 | 8.0 | |
| Bottom | ||||||||
| Eyrac | Surface | 2020-10-08 | 2026-04-23 | 5.5 | 113 | 1.0 | 7.3 | |
| Bottom | ||||||||
| Banyuls | Sola | Surface | 2019-01-07 | 2026-04-30 | 7.3 | 307 | 3.0 | 3.0 |
| Bottom | 2019-01-07 | 2026-04-30 | 7.3 | 307 | 24.0 | 24.0 | ||
| Sète | Sète | Surface | 2020-10-09 | 2025-12-17 | 5.2 | 127 | 2.0 | 2.0 |
| Bottom | ||||||||
| Marseille | Frioul | Surface | 2018-02-07 | 2026-05-26 | 8.3 | 188 | 1.0 | 1.0 |
| Bottom | 2018-02-21 | 2026-05-26 | 8.3 | 176 | 1.0 | 55.0 | ||
| Villefranche-sur-Mer | Point B | Surface | 2007-01-09 | 2024-03-25 | 17.2 | 793 | 1.0 | 2.0 |
| Bottom | 2007-01-09 | 2024-03-25 | 17.2 | 780 | 50.0 | 50.0 |
4.2 Data visualisation
The SOMLIT stations are presented from north to south. Only spectrophotometric pH observations on the total scale are shown.
4.2.1 Wimereux
4.2.2 Luc-sur-Mer
4.2.3 Roscoff
4.2.4 Brest
4.2.5 La Rochelle
4.2.6 Arcachon
4.2.7 Banyuls
4.2.8 Sète
4.2.9 Marseille
4.2.10 Villefranche-sur-Mer
4.3 Descriptive statistics
Descriptive statistics are calculated from the spectrophotometric pH data retained above. They are reported separately for each SOMLIT station, monitoring site, and sampling level.
| Site | Station | Depth | Start date | End date | Time span (years) | N | Mean pHT | Median pHT | Minimum pHT | Maximum pHT |
|---|---|---|---|---|---|---|---|---|---|---|
| Wimereux | Point C | Surface | 2021-09-07 | 2026-06-15 | 4.8 | 55 | 7.918 | 7.919 | 7.736 | 8.480 |
| Bottom | 2021-09-07 | 2026-06-15 | 4.8 | 55 | 7.899 | 7.887 | 7.718 | 8.469 | ||
| Point L | Surface | 2021-09-07 | 2026-06-15 | 4.8 | 41 | 7.882 | 7.871 | 7.743 | 8.304 | |
| Bottom | 2021-09-07 | 2026-06-15 | 4.8 | 41 | 7.868 | 7.857 | 7.758 | 8.285 | ||
| Luc-sur-Mer | Luc-sur-Mer | Surface | 2020-01-21 | 2026-02-02 | 6.0 | 126 | 7.843 | 7.811 | 7.726 | 8.149 |
| Bottom | ||||||||||
| Smile | Surface | 2020-01-21 | 2026-02-02 | 6.0 | 126 | 7.852 | 7.822 | 7.744 | 8.104 | |
| Bottom | ||||||||||
| Dinard | Cézembre | Surface | ||||||||
| Bottom | ||||||||||
| Le Buron | Surface | |||||||||
| Bottom | ||||||||||
| Roscoff | Astan | Surface | 2018-01-11 | 2026-06-23 | 8.4 | 200 | 7.836 | 7.832 | 7.774 | 7.961 |
| Bottom | 2018-01-11 | 2026-06-23 | 8.4 | 199 | 7.834 | 7.830 | 7.772 | 7.923 | ||
| Estacade | Surface | 2018-01-11 | 2026-06-23 | 8.4 | 201 | 7.864 | 7.848 | 7.759 | 8.055 | |
| Bottom | ||||||||||
| Brest | Lanvéoc | Surface | ||||||||
| Bottom | ||||||||||
| Portzic | Surface | 2019-07-01 | 2026-04-27 | 6.8 | 332 | 7.863 | 7.860 | 7.747 | 8.138 | |
| Bottom | ||||||||||
| La Rochelle | Antioche | Surface | 2021-01-05 | 2026-07-03 | 5.5 | 115 | 7.873 | 7.864 | 7.793 | 8.025 |
| Bottom | ||||||||||
| Gironde | pk30 | Surface | ||||||||
| Bottom | ||||||||||
| pk52 | Surface | |||||||||
| Bottom | ||||||||||
| pk86 | Surface | |||||||||
| Bottom | ||||||||||
| Arcachon | Bouée 13 | Surface | 2020-10-08 | 2026-04-23 | 5.5 | 113 | 7.900 | 7.896 | 7.799 | 8.050 |
| Bottom | ||||||||||
| Comprian | Surface | 2020-10-08 | 2026-04-23 | 5.5 | 113 | 7.809 | 7.800 | 7.650 | 7.970 | |
| Bottom | ||||||||||
| Eyrac | Surface | 2020-10-08 | 2026-04-23 | 5.5 | 113 | 7.833 | 7.830 | 7.730 | 7.990 | |
| Bottom | ||||||||||
| Banyuls | Sola | Surface | 2019-01-07 | 2026-04-30 | 7.3 | 307 | 7.982 | 7.965 | 7.660 | 8.430 |
| Bottom | 2019-01-07 | 2026-04-30 | 7.3 | 307 | 7.973 | 7.950 | 7.670 | 8.480 | ||
| Sète | Sète | Surface | 2020-10-09 | 2025-12-17 | 5.2 | 127 | 7.965 | 7.957 | 7.882 | 8.143 |
| Bottom | ||||||||||
| Marseille | Frioul | Surface | 2018-02-07 | 2026-05-26 | 8.3 | 188 | 7.965 | 7.961 | 7.907 | 8.040 |
| Bottom | 2018-02-21 | 2026-05-26 | 8.3 | 176 | 7.940 | 7.937 | 7.830 | 8.030 | ||
| Villefranche-sur-Mer | Point B | Surface | 2007-01-09 | 2024-03-25 | 17.2 | 793 | 7.976 | 7.975 | 7.900 | 8.045 |
| Bottom | 2007-01-09 | 2024-03-25 | 17.2 | 780 | 7.957 | 7.955 | 7.885 | 8.030 |
4.4 Monthly climatologies
The monthly climatology is calculated using only spectrophotometric pH data. For each monitoring site and sampling level, all individual observations from the same calendar month are included directly in the calculation; observations are not averaged by year-month beforehand.
4.4.1 Wimereux
4.4.2 Luc-sur-Mer
4.4.3 Roscoff
4.4.4 Brest
4.4.5 La Rochelle
4.4.6 Arcachon
4.4.7 Banyuls
4.4.8 Sète
4.4.9 Marseille
4.4.10 Villefranche-sur-Mer
4.5 Monthly anomalies
Anomalies are calculated for every individual spectrophotometric observation as the measured pH minus the climatological pH of the corresponding calendar month, monitoring site, and sampling level. No monthly averaging is performed.
4.5.1 Wimereux
4.5.2 Luc-sur-Mer
4.5.3 Roscoff
4.5.4 Brest
4.5.5 La Rochelle
4.5.6 Arcachon
4.5.7 Banyuls
4.5.8 Sète
4.5.9 Marseille
4.5.10 Villefranche-sur-Mer
4.6 Temporal trends
Linear trends are estimated from all individual spectrophotometric pH anomalies using generalised least squares (GLS). A first-order autoregressive AR(1) correlation structure is applied to observations in chronological order, retaining measurements that share the same date. Models are fitted separately for each monitoring site and sampling level. Slopes are expressed in pH units per decade.
| Site | Station | Depth | N | Start date | End date | Time span (years) | Slope per decade | SE per decade | Lower 95% CI per decade | Upper 95% CI per decade | p-value | AR(1) rho | Model |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wimereux | Point C | Surface | 55 | 2021-09-07 | 2026-06-15 | 4.8 | 0.0293 | 0.1268 | -0.2249 | 0.2835 | 0.8180 | 0.3884 | GLS AR(1) |
| Bottom | 55 | 2021-09-07 | 2026-06-15 | 4.8 | 0.0053 | 0.1242 | -0.2439 | 0.2545 | 0.9660 | 0.3447 | GLS AR(1) | ||
| Point L | Surface | 41 | 2021-09-07 | 2026-06-15 | 4.8 | -0.0201 | 0.0833 | -0.1886 | 0.1484 | 0.8103 | 0.0168 | GLS AR(1) | |
| Bottom | 41 | 2021-09-07 | 2026-06-15 | 4.8 | -0.0271 | 0.0745 | -0.1777 | 0.1235 | 0.7182 | 0.0531 | GLS AR(1) | ||
| Luc-sur-Mer | Luc-sur-Mer | Surface | 126 | 2020-01-21 | 2026-02-02 | 6.0 | -0.0357 | 0.0318 | -0.0986 | 0.0272 | 0.2637 | 0.2318 | GLS AR(1) |
| Bottom | |||||||||||||
| Smile | Surface | 126 | 2020-01-21 | 2026-02-02 | 6.0 | -0.0265 | 0.0399 | -0.1055 | 0.0524 | 0.5070 | 0.4143 | GLS AR(1) | |
| Bottom | |||||||||||||
| Dinard | Cézembre | Surface | |||||||||||
| Bottom | |||||||||||||
| Le Buron | Surface | ||||||||||||
| Bottom | |||||||||||||
| Roscoff | Astan | Surface | 200 | 2018-01-11 | 2026-06-23 | 8.4 | 0.0086 | 0.0052 | -0.0017 | 0.0190 | 0.1010 | 0.2708 | GLS AR(1) |
| Bottom | 199 | 2018-01-11 | 2026-06-23 | 8.4 | 0.0079 | 0.0055 | -0.0029 | 0.0187 | 0.1516 | 0.2927 | GLS AR(1) | ||
| Estacade | Surface | 201 | 2018-01-11 | 2026-06-23 | 8.4 | -0.0069 | 0.0079 | -0.0225 | 0.0088 | 0.3884 | -0.0440 | GLS AR(1) | |
| Bottom | |||||||||||||
| Brest | Lanvéoc | Surface | |||||||||||
| Bottom | |||||||||||||
| Portzic | Surface | 332 | 2019-07-01 | 2026-04-27 | 6.8 | -0.0658 | 0.0145 | -0.0943 | -0.0374 | <0.0001 | 0.1491 | GLS AR(1) | |
| Bottom | |||||||||||||
| La Rochelle | Antioche | Surface | 115 | 2021-01-05 | 2026-07-03 | 5.5 | 0.0227 | 0.0195 | -0.0159 | 0.0614 | 0.2465 | 0.1340 | GLS AR(1) |
| Bottom | |||||||||||||
| Gironde | pk30 | Surface | |||||||||||
| Bottom | |||||||||||||
| pk52 | Surface | ||||||||||||
| Bottom | |||||||||||||
| pk86 | Surface | ||||||||||||
| Bottom | |||||||||||||
| Arcachon | Bouée 13 | Surface | 113 | 2020-10-08 | 2026-04-23 | 5.5 | -0.0035 | 0.0180 | -0.0391 | 0.0321 | 0.8462 | -0.0671 | GLS AR(1) |
| Bottom | |||||||||||||
| Comprian | Surface | 113 | 2020-10-08 | 2026-04-23 | 5.5 | -0.0042 | 0.0222 | -0.0482 | 0.0399 | 0.8513 | 0.0301 | GLS AR(1) | |
| Bottom | |||||||||||||
| Eyrac | Surface | 113 | 2020-10-08 | 2026-04-23 | 5.5 | -0.0307 | 0.0207 | -0.0717 | 0.0102 | 0.1401 | -0.0040 | GLS AR(1) | |
| Bottom | |||||||||||||
| Banyuls | Sola | Surface | 307 | 2019-01-07 | 2026-04-30 | 7.3 | -0.1312 | 0.0358 | -0.2015 | -0.0608 | 0.0003 | 0.5148 | GLS AR(1) |
| Bottom | 307 | 2019-01-07 | 2026-04-30 | 7.3 | -0.1640 | 0.0466 | -0.2556 | -0.0723 | 0.0005 | 0.5952 | GLS AR(1) | ||
| Sète | Sète | Surface | 127 | 2020-10-09 | 2025-12-17 | 5.2 | 0.0173 | 0.0232 | -0.0286 | 0.0631 | 0.4573 | 0.0919 | GLS AR(1) |
| Bottom | |||||||||||||
| Marseille | Frioul | Surface | 188 | 2018-02-07 | 2026-05-26 | 8.3 | -0.0131 | 0.0073 | -0.0275 | 0.0014 | 0.0759 | 0.2020 | GLS AR(1) |
| Bottom | 176 | 2018-02-21 | 2026-05-26 | 8.3 | -0.0093 | 0.0095 | -0.0280 | 0.0094 | 0.3293 | 0.1605 | GLS AR(1) | ||
| Villefranche-sur-Mer | Point B | Surface | 793 | 2007-01-09 | 2024-03-25 | 17.2 | -0.0183 | 0.0017 | -0.0216 | -0.0150 | <0.0001 | 0.4214 | GLS AR(1) |
| Bottom | 780 | 2007-01-09 | 2024-03-25 | 17.2 | -0.0174 | 0.0018 | -0.0209 | -0.0139 | <0.0001 | 0.3692 | GLS AR(1) |
4.6.1 Wimereux
4.6.2 Luc-sur-Mer
4.6.3 Roscoff
4.6.4 Brest
4.6.5 La Rochelle
4.6.6 Arcachon
4.6.7 Banyuls
4.6.8 Sète
4.6.9 Marseille
4.6.10 Villefranche-sur-Mer
5 Synthesis
Because pHNBS and pHT cover different periods and are reported on different scales, their time series are not combined. This table presents the two method-specific trends side by side. Each slope is estimated independently from method-specific monthly anomalies using GLS with an AR(1) correlation structure in chronological observation order. Slopes and standard errors are expressed in pH units per decade.
| Site | Station | Depth | N pHNBS | pHNBS start | pHNBS end | pHNBS time span (years) | pHNBS slope per decade | pHNBS SE per decade | N pHT | pHT start | pHT end | pHT time span (years) | pHT slope per decade | pHT SE per decade |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wimereux | Point L | Surface | 281 | 1997-12-03 | 2021-07-26 | 23.6 | -0.0022 | 0.0143 | 41 | 2021-09-07 | 2026-06-15 | 4.8 | -0.0201 | 0.0833 |
| Bottom | 277 | 1997-12-03 | 2021-07-26 | 23.6 | -0.0101 | 0.0130 | 41 | 2021-09-07 | 2026-06-15 | 4.8 | -0.0271 | 0.0745 | ||
| Point C | Surface | 347 | 1997-12-03 | 2021-07-26 | 23.6 | 0.0078 | 0.0136 | 55 | 2021-09-07 | 2026-06-15 | 4.8 | 0.0293 | 0.1268 | |
| Bottom | 343 | 1997-12-03 | 2021-07-26 | 23.6 | -0.0104 | 0.0131 | 55 | 2021-09-07 | 2026-06-15 | 4.8 | 0.0053 | 0.1242 | ||
| Luc-sur-Mer | Smile | Surface | 129 | 2013-04-09 | 2019-12-11 | 6.7 | -0.1486 | 0.0525 | 126 | 2020-01-21 | 2026-02-02 | 6.0 | -0.0265 | 0.0399 |
| Luc-sur-Mer | Surface | 284 | 2007-01-04 | 2019-12-13 | 12.9 | -0.1460 | 0.0222 | 126 | 2020-01-21 | 2026-02-02 | 6.0 | -0.0357 | 0.0318 | |
| Dinard | Le Buron | Surface | 269 | 2012-03-27 | 2023-08-21 | 11.4 | -0.0994 | 0.0207 | 0 | NA | NA | NA | NA | NA |
| Bottom | 49 | 2012-03-27 | 2013-11-21 | 1.7 | 0.2345 | 0.2078 | 0 | NA | NA | NA | NA | NA | ||
| Cézembre | Surface | 195 | 2014-03-07 | 2023-08-21 | 9.5 | -0.1713 | 0.0284 | 0 | NA | NA | NA | NA | NA | |
| Roscoff | Estacade | Surface | 406 | 2001-01-08 | 2017-12-12 | 16.9 | -0.1305 | 0.0079 | 201 | 2018-01-11 | 2026-06-23 | 8.4 | -0.0069 | 0.0079 |
| Astan | Surface | 405 | 2001-01-08 | 2017-12-12 | 16.9 | -0.1202 | 0.0072 | 200 | 2018-01-11 | 2026-06-23 | 8.4 | 0.0086 | 0.0052 | |
| Bottom | 402 | 2001-01-04 | 2017-12-12 | 16.9 | -0.1256 | 0.0073 | 199 | 2018-01-11 | 2026-06-23 | 8.4 | 0.0079 | 0.0055 | ||
| Brest | Portzic | Surface | 837 | 2002-03-19 | 2019-06-21 | 17.3 | -0.1675 | 0.0079 | 332 | 2019-07-01 | 2026-04-27 | 6.8 | -0.0658 | 0.0145 |
| Lanvéoc | Surface | 158 | 2019-01-28 | 2026-04-23 | 7.2 | -0.0257 | 0.0148 | 0 | NA | NA | NA | NA | NA | |
| La Rochelle | Antioche | Surface | 210 | 2011-06-22 | 2020-12-07 | 9.5 | -0.0705 | 0.0248 | 115 | 2021-01-05 | 2026-07-03 | 5.5 | 0.0227 | 0.0195 |
| Gironde | pk86 | Surface | 484 | 1997-09-09 | 2026-03-26 | 28.5 | 0.0430 | 0.0180 | 0 | NA | NA | NA | NA | NA |
| Bottom | 480 | 1997-10-08 | 2026-03-26 | 28.5 | 0.0425 | 0.0172 | 0 | NA | NA | NA | NA | NA | ||
| pk52 | Surface | 518 | 1997-09-11 | 2026-03-25 | 28.5 | -0.0095 | 0.0150 | 0 | NA | NA | NA | NA | NA | |
| Bottom | 517 | 1997-10-07 | 2026-03-25 | 28.5 | -0.0167 | 0.0155 | 0 | NA | NA | NA | NA | NA | ||
| pk30 | Surface | 513 | 1997-09-08 | 2026-03-27 | 28.5 | -0.0661 | 0.0157 | 0 | NA | NA | NA | NA | NA | |
| Bottom | 512 | 1997-09-08 | 2026-03-27 | 28.5 | -0.0791 | 0.0159 | 0 | NA | NA | NA | NA | NA | ||
| Arcachon | Comprian | Surface | 334 | 2005-02-03 | 2020-09-24 | 15.6 | -0.1365 | 0.0161 | 113 | 2020-10-08 | 2026-04-23 | 5.5 | -0.0042 | 0.0222 |
| Eyrac | Surface | 607 | 1997-09-24 | 2020-09-24 | 23.0 | -0.0707 | 0.0085 | 113 | 2020-10-08 | 2026-04-23 | 5.5 | -0.0307 | 0.0207 | |
| Bottom | 270 | 1997-09-24 | 2004-09-17 | 7.0 | 0.2341 | 0.0363 | 0 | NA | NA | NA | NA | NA | ||
| Bouée 13 | Surface | 334 | 2005-02-03 | 2020-09-24 | 15.6 | -0.2109 | 0.0213 | 113 | 2020-10-08 | 2026-04-23 | 5.5 | -0.0035 | 0.0180 | |
| Banyuls | Sola | Surface | 760 | 2002-04-02 | 2018-12-18 | 16.7 | -0.0158 | 0.0225 | 307 | 2019-01-07 | 2026-04-30 | 7.3 | -0.1312 | 0.0358 |
| Bottom | 763 | 2002-04-02 | 2018-12-18 | 16.7 | -0.0136 | 0.0233 | 307 | 2019-01-07 | 2026-04-30 | 7.3 | -0.1640 | 0.0466 | ||
| Sète | Sète | Surface | 50 | 2017-10-24 | 2020-09-16 | 2.9 | -1.2244 | 0.5712 | 127 | 2020-10-09 | 2025-12-17 | 5.2 | 0.0173 | 0.0232 |
| Marseille | Frioul | Surface | 167 | 2011-01-11 | 2017-12-13 | 6.9 | -0.0530 | 0.0234 | 188 | 2018-02-07 | 2026-05-26 | 8.3 | -0.0131 | 0.0073 |
| Bottom | 152 | 2011-01-11 | 2018-01-24 | 7.0 | -0.0873 | 0.0307 | 176 | 2018-02-21 | 2026-05-26 | 8.3 | -0.0093 | 0.0095 | ||
| Villefranche-sur-Mer | Point B | Surface | 0 | NA | NA | NA | NA | NA | 793 | 2007-01-09 | 2024-03-25 | 17.2 | -0.0183 | 0.0017 |
| Bottom | 0 | NA | NA | NA | NA | NA | 780 | 2007-01-09 | 2024-03-25 | 17.2 | -0.0174 | 0.0018 |